import com.sun.xml.internal.ws.resources.EncodingMessages; //导入依赖的package包/类
@Nullable
public Attachment get(String contentId) {
    Attachment att;
    /**
     * First try to get the Attachment from internal map, maybe this attachment
     * is added by the user.
     */
    att = atts.get(contentId);
    if(att != null)
        return att;
    try {
        /**
         * Attachment is not found in the internal map, now do look in
         * the mpp, if found add to the internal Attachment map.
         */
        att = mpp.getAttachmentPart(contentId);
        if(att != null){
            atts.put(contentId, att);
        }
    } catch (IOException e) {
        throw new WebServiceException(EncodingMessages.NO_SUCH_CONTENT_ID(contentId), e);
    }
    return att;
}
 

import com.sun.xml.internal.ws.resources.EncodingMessages; //导入依赖的package包/类
@Override
public DataHandler getAttachmentAsDataHandler(String cid) {
    Attachment a = attachments.get(stripScheme(cid));
    if(a==null)
        throw new WebServiceException(EncodingMessages.NO_SUCH_CONTENT_ID(cid));
    return a.asDataHandler();
}
 

import com.sun.xml.internal.ws.resources.EncodingMessages; //导入依赖的package包/类
@Override
public byte[] getAttachmentAsByteArray(String cid) {
    Attachment a = attachments.get(stripScheme(cid));
    if(a==null)
        throw new WebServiceException(EncodingMessages.NO_SUCH_CONTENT_ID(cid));
    return a.asByteArray();
}